Industrial aluminum profile processing annealing is divided into sheet annealing and foil annealing. The purpose of annealing: eliminate cold work hardening in order to continue rolling or deep processing; control the status and performance of the product; remove the rolling oil and improve the surface quality.
According to the production capacity and scale, the aluminum annealing furnace is divided into single annealing and annealing furnaces. The annealing line is generally composed of several annealing furnaces, compound loading and unloading vehicles, furnace material tables and cooling chambers. The furnace adopts a large fan to heat the aluminum material. The guiding device in the furnace can effectively ensure that the airflow passes through the aluminum evenly, making it evenly heated. The heater adopts a top-mounted monolithic structure for easy disassembly and maintenance. The door opening and closing adopts pneumatic pressure-type or mechanical transmission-elevation type, with stable operation and good sealing performance. The fume extraction system of the furnace can effectively remove the oil film on the surface of aluminum and regulate the pressure in the furnace. The furnace charge is generally 10 to 50 tons.
Aluminum annealing furnace is the most widely used equipment in aluminum heat treatment by aluminium fence manufacturers. With the development of technology and the product quality, there higher requirements have been put on the aluminum annealing, such as the consistency of the appearance quality and performance indicators of the annealed products. The appearance quality includes peeling, air bubbles, oil spots, oxidation corrosion and surface finish. Intrinsic quality includes mechanical properties, grain size, anisotropy and other aspects. Except the annealing process and equipment, the before processing of annealing, such as ingredient composition, casting process and cold working rate, also has an important effect on the intrinsic quality of the annealed product.